Robots meta tag gives option that crawl or not crawl specific page.It also informs about do-follow and no-follow links on the web page.whereas robots.txt is a list of a directories which mainly used for restriction about crawling of a specific web pages.so both used for different purposes and not better than each other.

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The meta tags option tells bots not to index individual files, whereas robots.txt can be used to restrict access to entire directories.Sure, use A meta tag if you have the odd page in indexed folders that you want skipping, but generally, I would recommend you most of your non-indexed content in one or more folders and use robots.txt to skip the lot.No, there isn't a problem in using both - if there is a clash, in general terms, a deny will overrule an allow.